QuerySummaryState()

[Cylintcode]

Hey guys, I was looking through the code and I apologize if it already handles something like this.. but it is not apparent to me if it does.

On sockets you can send QuerySummaryState and receive a large snapshot of all the current pairs and their associated values. You can then run updateSummaryState which reports the delta's as they change. The advantage here is for low volume coins you get the current values without having to wait for an updateSummaryState delta to come through on it. Up until recently doge was a good example of a coin like this.

I would be willing to help implement something like this if someone is not already working on it. Rather not waste my time if there is a working solution or someone already has it under wraps.